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Helm, Heather. "Studies Dealing With Twins." Apr. 17, 2003. <http://www.ux1.eiu.edu/~cxtdm/twins.html>
Nature vs. Nurture
Torgersen, S., Onstad, S., & Skre, I. (1993). "True" schizotypal personality disorder: A study of co-twins and relatives of schizophrenic probands. American Journal of Psychiatry, 150, 1661-1667.
Bipolar Disorder and Twins
Burgess, M. "Brithinee Twins Never Take the Electric Motor for Granted." Inland Empire Business Journal: Corporate Profile. May 2003, p. 9. Accessed Mar. 31, 2004: http://www.brithinee.com/BRI-PR.pdf
Brithinee Electric
Macindoe, Ian, Ph.D. 2004. "Happiness: What studies on twins tell us about nature, nurture, and the happiness set point." Accessed via the Internet 2/7/05. <http://dlibrary.acu.edu.au/ageing/thot04dec03.html>
Mental Health in Children
The Tragedy of Pudd'nhead Wilson and the Comedy of Those Extraordinary Twins, November 28, 1894
Mark Twain
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